Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
luan trong » quan trong, luat trong, luan tuong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
hoc hieu » hoc thieu, hoc hien, doc hieu
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu nganh - hanh tang luan trong cong ((tac toan) OR (tap toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - hanh tang luan trong cong ((tac toan) OR (tap toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - hanh tang luan trong cong ((tac toan) OR (tap toan)) cao*.